Title page for ETD etd-03112010-104801


Document Type Master's Dissertation
Author Grobbelaar, Annerina
Email annerinav@yahoo.com
URN etd-03112010-104801
Document Title Linear frequency transposition and word recognition abilities of children with moderate-to-severe sensorineural hearing loss
Degree MCommunication Pathology
Department Communication Pathology
Supervisor
Advisor Name Title
Mrs E Groenewald Co-Supervisor
Dr C van Dijk Supervisor
Keywords
  • moderate-to-severe sensorineural hearing loss
  • linear frequency transposition
  • hearing aids
  • evidence-based practice
  • developing contexts
  • developed countries
  • children with hearing loss
  • audiology
  • advanced digital signal processing
  • paediatric amplification
  • Word Intelligibility by Picture Identification
  • WIPI
  • word recognition
Date 2009-09-01
Availability unrestricted
Abstract
Conventional hearing aid circuitry is often unable to provide children with hearing loss with sufficient high frequency information in order to develop adequate oral language skills due to the risk of acoustic feedback and the narrower frequency spectrum of conventional amplification. The purpose of this study was to investigate word recognition abilities of children with moderate-to-severe hearing loss using hearing aids with linear frequency transposition. Seven children with moderate-to-severe sensorineural hearing loss between the ages of 5 years 0 months and 7 years 11 months were selected for the participant group. Word recognition assessments were first performed with the participants using their own previous generation digital signal processing hearing aids. Twenty-five-word lists from the Word Intelligibility by Picture Identification (WIPI) test were presented to the participants in three test conditions, namely: at 55 dB HL in quiet, 55 dB HL with a +5 dB signal-to-noise ratio (SNR) and at 35 dB HL. The participants were then fitted with an ISP-based hearing aid without linear frequency transposition, and the word recognition assessments were repeated with different WIPI word lists under the same conditions as the first assessment. Linear frequency transposition was then activated in the ISP-based hearing aid and different WIPI word lists were presented once more under identical conditions as the previous assessments. A 12-day acclimatization period was allowed between assessments, and all fittings were verified according to the DSL v5 fitting algorithm. Results indicated a significant increase of more than 12% in word recognition score for some of the participants when they used the ISP-based hearing aid with linear frequency transposition. A significant decrease was also seen for some of the participants when they used the ISP-based hearing aid with linear frequency transposition, but all participants presented with better word recognition scores when they used the ISP-based hearing aids without linear frequency transposition compared to their previous generation digital signal processing hearing aids. This study has shown that linear frequency transposition may improve the word recognition skills of some children with moderate-to-severe sensorineural hearing loss, and more research is needed to explore the criteria that can be used to determine candidacy for linear frequency transposition.

2009, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Grobbelaar, A 2009, Linear frequency transposition and word recognition abilities of children with moderate-to-severe sensorineural hearing loss, MCommunication Pathology dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-03112010-104801/ >

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